belcher



(Model.) 2 Sheets-Sheet 1;

A* apngLoHR. Hand Drill.

No. 240,223. Patented April 19, 188|..

N, PETERS. PHOTO-LITHOGR'APMER, WASHINGTON, D. c.

2 Sheets-Sheet 2v,

(Model.) v

G.'D. BELGHBR.

Hand Drill.

No. 240,223. Patented April 19,1881.

www

N. PETERS. PHOTO-LITHOGRAPHER. wAsHxNGToN, D, c.

UNITED STATES PATENT OFFICE.

ONE-HALF T() WILLIAM C. MCCLALLAN; OF SAME PLACE.

HAND-DRI LL.

SPECIFICATION forming part of Letters Patent No. 240,223, dated April19, 1881.

Application filed December 13, 1880.

To all whom it may concern:

Be it known that l, GEORGE D. BELCHEE, of Springfield, State ofMassachusetts, have invented an Improvement in Hand-Drills, of which thefollowing is a specification.

My invention consists ofimprovements upon the hand-drill for whichpatent was granted George D. Vashburn, J nl y 26,1859,No.24,894, inwhich a stem having one end revolving in ahandle and its other endprovided with a drill has intersecting right and left grooves and anutsleeve, which, when reeiprocated on said stem, imparts a rotarymotion in one and the same direction to the drill; and my improvementshave for their obj ect the perfection of the mechanism for producingthe' results aimed at by reducing to the minimum the friction betweenthe operatin nut and screwstem.

In the drawings, Figure I is a general view of the drill with theguiding-sleeve removed. Figs. II, III, IV,'and V are enlarged details.Fig. VI is a view of the complete drill; and Fig. VII is a partialcross-section on the line a' a', Fig. VI.

The stem B, having the drill b secured in the usual way on its prolongedaxis, is provided with the right and left grooves d d', in sets of two;the grooves of each being parallel, and being of the saine pitch, andthe one set intersecting the other set, form upon the stem B what is, ineffect, a right-and-left quick-screw, as shown in Fig. I. Upon thisscrew-stem B, and between the stops formed by the collar f at one endand the handle g, into which it is stepped, at the other end ofthe stem,is sleeved the operating-slide D, which, by its reciprocation, givesmotion to the drill.

The slide orhandle D consists of the right and left nuts H H', whoselands or grooves h h' engage, respectively, with the threads d d ot' thestem B of the ends L L', sleeved upon the outer surface of the stem B,and rigidly connected or framed to each other, as'shown in Figs. ll andV, and of the connections l l, that serve to so frame the ends L L tothe outer case of the handle D by passing through the slots in the wallof the case P of the drillstern B, as shown in Fig. VII. The outer edgesof the nuts H H are provided with (Model.)

ratchet-teeth to clutchwith corresponding teeth upon the inner faces ofthe sleeve ends L L', and these nuts H H', thus inclosed between theends L L', have sufficient space left between them to enable one to bedisengaged while the other is clutched fast to the slide D, so that whenthe slide D is moved one nut becomes part of the slide to impart motionto `the drill, while the other is free to follow within the slide uponthe stem until the direction of the slideD is changed, when it, in itsturn, becomes operative with the slide, both directions taken by theslide being converted into a rotation in one and the same direction tothe drill, the only lost time in the positive action ofthe slidehandle Dbeing the short interval taken in moving the slide a distancecorresponding to the space between the two nuts within it upon reversingits direction.

The general operation of the device, as above described, is common tothe patent before alluded to; but in operation it is found that whereone thread, as in a common screw, is used to impart through a segment ofa nut a rotation, the slide will bind upon the opposite side of the stemfrom the engaging segment, and that in practice it is impossible, whereone thread is employed, to prevent a distortion of the slide from itsnormal position to produce an excessive friction-to entirely obviatewhich I arrange upon the stem two parallel threads, as shown in thedrawings, so that the segments l1, It' will engage withv threadssimultaneously upon opposite sides of the stem B to completely balancethe slide D upon its stem. And to further remove a source of friction-z.e., that produced by the ends of the segments h h' coming against thebottoms of the grooves d d'-the handle D is suspended upon thesleeve-case P, secured, as shown in Fig. VI, to the handle g at one ot'its ends and over the drill-stem at its other.

The sleeve P is slotted upon each side, to permit the connections Z l tounite the ratchet ends L L with the outer shell of slide D, and theedges of this slot form' straight edges, to assist in guiding andholding the segments h h' in their proper relative position.

By these means I form a hand-drill in which the friction is reduced tothe minimum to ren- ICO 2. The combination, with the stein B, having:right and left intersecting grooves or lands d d', and with the slottedsleeve P, the operating slide-handle D, bearing upon the sleeve P andagainst the straight edge of its slots, and engaging With thescrew-ste1n B, as shown and described.

GEORGE D. BELGHER.

Witnesses:

R. F. HYDE, F. E. CARPENTER.

